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How to detect the inner part of the core?

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I am trying to figure out how to find out the size of the core in the image, inner part for example best fit circle btu I am struggling, please see the code below I tried, and the images core is the main imafe and circle not fit is what I have tried so far. even if I can get some sort of contour of the inner core and extract the points and put the best fit circle but so far like 5 - 6 hours and no success here. Help would be great.
% Read in image
img = imread('Export.6t9zq5l4.000022a.jpg');
%[J,rect] = imcrop(img);
img = imcrop(img, [1030.51000000000,650.510000000000,638.980000000000,599.980000000000]);
% Convert image to grayscale
gray_img = rgb2gray(img);
% Smooth image
gray_img = medfilt2(gray_img, [3 3]);
% Apply threshold to grayscale image
threshold = graythresh(gray_img);
gray_img = imbinarize(gray_img, threshold);
gray_img = bwareaopen(gray_img, 1000);
se = strel('disk', 10);
dilated_img = imdilate(gray_img, se);
eroded_img = imerode(dilated_img, se);
[centers, radii] = imfindcircles(eroded_img, [40 55], 'ObjectPolarity','bright', 'Sensitivity',0.1);
viscircles(centers, radii, 'Color', 'r', 'LineWidth', 2);
hold on;
viscircles(centers, radii, 'Color', 'r', 'LineWidth', 2);
hold off;

Answers (1)

Sulaymon Eshkabilov
Sulaymon Eshkabilov on 13 Jan 2023
  1 Comment
muhammad choudhry
muhammad choudhry on 13 Jan 2023
Yea, the core is not basically well defined circle or ellipse hence what is in the link above not capturing accurately.

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